期刊
JOURNAL OF MOLECULAR STRUCTURE
卷 1290, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.molstruc.2023.135911
关键词
NHC-palladium complex; A3 coupling; Propargylamines; Bisamide ligand
A novel nanomagnetic NHC-Palladium complex was successfully prepared through post-synthetic modification (PSM) condensation and chelation of Pd ions. The [Fe3O4@bisimidazolium-Pd]2Cl- complex showed excellent catalytic performance in synthesizing propargylamines. It can be reused seven times without any loss of its catalytic ability, indicating its stability in reactions.
Herein, a novel nanomagnetic NHC-Palladium complex was successfully prepared applying post-synthetic modification (PSM) condensation between Fe3O4-support imidazole and a synthetic bisamide moiety, carrying the alkyl halide functionalities at the end of its chain, followed by chelation of Pd ions to generate the corresponding complex. The [Fe3O4@bisimidazolium-Pd]2Cl- complex gave the best catalytic performance in synthesizing propargylamines through A3 coupling of various substituted aromatic and cycloaliphatic aldehydes and secondary amines with aromatic and liner alkynes in PEG-400. Primary amines are inefficient to produce unknown byproducts; whereas, secondary amines react quickly. Significantly, alkynes having a high electron density reduce the conversion rate. Moreover, aromatic and aliphatic aldehydes are active, but the electrondrawing substituent on benzaldehyde decreases the rate of conversion. Furthermore, the [Fe3O4@bisimidazolium-Pd]2Cl- catalyst can be reused seven times without metal leaching or losing its ability, which shows how stable it is when used in a reaction.
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